| /* |
| * Copyright (C) 2002 Jeff Dike (jdike@karaya.com) |
| * Licensed under the GPL |
| */ |
| |
| #include <stdio.h> |
| #include <unistd.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <signal.h> |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <sys/socket.h> |
| #include <sys/un.h> |
| #include <sys/ioctl.h> |
| #include <sys/mount.h> |
| #include <sys/uio.h> |
| #include "os.h" |
| #include "user.h" |
| #include "kern_util.h" |
| |
| static void copy_stat(struct uml_stat *dst, struct stat64 *src) |
| { |
| *dst = ((struct uml_stat) { |
| .ust_dev = src->st_dev, /* device */ |
| .ust_ino = src->st_ino, /* inode */ |
| .ust_mode = src->st_mode, /* protection */ |
| .ust_nlink = src->st_nlink, /* number of hard links */ |
| .ust_uid = src->st_uid, /* user ID of owner */ |
| .ust_gid = src->st_gid, /* group ID of owner */ |
| .ust_size = src->st_size, /* total size, in bytes */ |
| .ust_blksize = src->st_blksize, /* blocksize for filesys I/O */ |
| .ust_blocks = src->st_blocks, /* number of blocks allocated */ |
| .ust_atime = src->st_atime, /* time of last access */ |
| .ust_mtime = src->st_mtime, /* time of last modification */ |
| .ust_ctime = src->st_ctime, /* time of last change */ |
| }); |
| } |
| |
| int os_stat_fd(const int fd, struct uml_stat *ubuf) |
| { |
| struct stat64 sbuf; |
| int err; |
| |
| CATCH_EINTR(err = fstat64(fd, &sbuf)); |
| if(err < 0) |
| return -errno; |
| |
| if(ubuf != NULL) |
| copy_stat(ubuf, &sbuf); |
| return err; |
| } |
| |
| int os_stat_file(const char *file_name, struct uml_stat *ubuf) |
| { |
| struct stat64 sbuf; |
| int err; |
| |
| do { |
| err = stat64(file_name, &sbuf); |
| } while((err < 0) && (errno == EINTR)) ; |
| |
| if(err < 0) |
| return -errno; |
| |
| if(ubuf != NULL) |
| copy_stat(ubuf, &sbuf); |
| return err; |
| } |
| |
| int os_access(const char* file, int mode) |
| { |
| int amode, err; |
| |
| amode=(mode&OS_ACC_R_OK ? R_OK : 0) | (mode&OS_ACC_W_OK ? W_OK : 0) | |
| (mode&OS_ACC_X_OK ? X_OK : 0) | (mode&OS_ACC_F_OK ? F_OK : 0) ; |
| |
| err = access(file, amode); |
| if(err < 0) |
| return -errno; |
| |
| return 0; |
| } |
| |
| void os_print_error(int error, const char* str) |
| { |
| errno = error < 0 ? -error : error; |
| |
| perror(str); |
| } |
| |
| /* FIXME? required only by hostaudio (because it passes ioctls verbatim) */ |
| int os_ioctl_generic(int fd, unsigned int cmd, unsigned long arg) |
| { |
| int err; |
| |
| err = ioctl(fd, cmd, arg); |
| if(err < 0) |
| return -errno; |
| |
| return err; |
| } |
| |
| int os_new_tty_pgrp(int fd, int pid) |
| { |
| if(ioctl(fd, TIOCSCTTY, 0) < 0) |
| return -errno; |
| |
| if(tcsetpgrp(fd, pid) < 0) |
| return -errno; |
| |
| return 0; |
| } |
| |
| /* FIXME: ensure namebuf in os_get_if_name is big enough */ |
| int os_get_ifname(int fd, char* namebuf) |
| { |
| if(ioctl(fd, SIOCGIFNAME, namebuf) < 0) |
| return -errno; |
| |
| return 0; |
| } |
| |
| int os_set_slip(int fd) |
| { |
| int disc, sencap; |
| |
| disc = N_SLIP; |
| if(ioctl(fd, TIOCSETD, &disc) < 0) |
| return -errno; |
| |
| sencap = 0; |
| if(ioctl(fd, SIOCSIFENCAP, &sencap) < 0) |
| return -errno; |
| |
| return 0; |
| } |
| |
| int os_set_owner(int fd, int pid) |
| { |
| if(fcntl(fd, F_SETOWN, pid) < 0){ |
| int save_errno = errno; |
| |
| if(fcntl(fd, F_GETOWN, 0) != pid) |
| return -save_errno; |
| } |
| |
| return 0; |
| } |
| |
| int os_mode_fd(int fd, int mode) |
| { |
| int err; |
| |
| do { |
| err = fchmod(fd, mode); |
| } while((err < 0) && (errno==EINTR)) ; |
| |
| if(err < 0) |
| return -errno; |
| |
| return 0; |
| } |
| |
| int os_file_type(char *file) |
| { |
| struct uml_stat buf; |
| int err; |
| |
| err = os_stat_file(file, &buf); |
| if(err < 0) |
| return err; |
| |
| if(S_ISDIR(buf.ust_mode)) |
| return OS_TYPE_DIR; |
| else if(S_ISLNK(buf.ust_mode)) |
| return OS_TYPE_SYMLINK; |
| else if(S_ISCHR(buf.ust_mode)) |
| return OS_TYPE_CHARDEV; |
| else if(S_ISBLK(buf.ust_mode)) |
| return OS_TYPE_BLOCKDEV; |
| else if(S_ISFIFO(buf.ust_mode)) |
| return OS_TYPE_FIFO; |
| else if(S_ISSOCK(buf.ust_mode)) |
| return OS_TYPE_SOCK; |
| else return OS_TYPE_FILE; |
| } |
| |
| int os_file_mode(char *file, struct openflags *mode_out) |
| { |
| int err; |
| |
| *mode_out = OPENFLAGS(); |
| |
| err = os_access(file, OS_ACC_W_OK); |
| if((err < 0) && (err != -EACCES)) |
| return(err); |
| |
| *mode_out = of_write(*mode_out); |
| |
| err = os_access(file, OS_ACC_R_OK); |
| if((err < 0) && (err != -EACCES)) |
| return(err); |
| |
| *mode_out = of_read(*mode_out); |
| |
| return(0); |
| } |
| |
| int os_open_file(char *file, struct openflags flags, int mode) |
| { |
| int fd, err, f = 0; |
| |
| if(flags.r && flags.w) f = O_RDWR; |
| else if(flags.r) f = O_RDONLY; |
| else if(flags.w) f = O_WRONLY; |
| else f = 0; |
| |
| if(flags.s) f |= O_SYNC; |
| if(flags.c) f |= O_CREAT; |
| if(flags.t) f |= O_TRUNC; |
| if(flags.e) f |= O_EXCL; |
| |
| fd = open64(file, f, mode); |
| if(fd < 0) |
| return(-errno); |
| |
| if(flags.cl && fcntl(fd, F_SETFD, 1)){ |
| err = -errno; |
| os_close_file(fd); |
| return err; |
| } |
| |
| return(fd); |
| } |
| |
| int os_connect_socket(char *name) |
| { |
| struct sockaddr_un sock; |
| int fd, err; |
| |
| sock.sun_family = AF_UNIX; |
| snprintf(sock.sun_path, sizeof(sock.sun_path), "%s", name); |
| |
| fd = socket(AF_UNIX, SOCK_STREAM, 0); |
| if(fd < 0) { |
| err = -errno; |
| goto out; |
| } |
| |
| err = connect(fd, (struct sockaddr *) &sock, sizeof(sock)); |
| if(err) { |
| err = -errno; |
| goto out_close; |
| } |
| |
| return fd; |
| |
| out_close: |
| close(fd); |
| out: |
| return err; |
| } |
| |
| void os_close_file(int fd) |
| { |
| close(fd); |
| } |
| |
| int os_seek_file(int fd, unsigned long long offset) |
| { |
| unsigned long long actual; |
| |
| actual = lseek64(fd, offset, SEEK_SET); |
| if(actual != offset) |
| return -errno; |
| return 0; |
| } |
| |
| int os_read_file(int fd, void *buf, int len) |
| { |
| int n = read(fd, buf, len); |
| |
| if(n < 0) |
| return -errno; |
| return n; |
| } |
| |
| int os_write_file(int fd, const void *buf, int len) |
| { |
| int n = write(fd, (void *) buf, len); |
| |
| if(n < 0) |
| return -errno; |
| return n; |
| } |
| |
| int os_file_size(char *file, unsigned long long *size_out) |
| { |
| struct uml_stat buf; |
| int err; |
| |
| err = os_stat_file(file, &buf); |
| if(err < 0){ |
| printk("Couldn't stat \"%s\" : err = %d\n", file, -err); |
| return(err); |
| } |
| |
| if(S_ISBLK(buf.ust_mode)){ |
| int fd; |
| long blocks; |
| |
| fd = os_open_file(file, of_read(OPENFLAGS()), 0); |
| if(fd < 0){ |
| printk("Couldn't open \"%s\", errno = %d\n", file, -fd); |
| return(fd); |
| } |
| if(ioctl(fd, BLKGETSIZE, &blocks) < 0){ |
| err = -errno; |
| printk("Couldn't get the block size of \"%s\", " |
| "errno = %d\n", file, errno); |
| os_close_file(fd); |
| return(err); |
| } |
| *size_out = ((long long) blocks) * 512; |
| os_close_file(fd); |
| return(0); |
| } |
| *size_out = buf.ust_size; |
| return(0); |
| } |
| |
| int os_file_modtime(char *file, unsigned long *modtime) |
| { |
| struct uml_stat buf; |
| int err; |
| |
| err = os_stat_file(file, &buf); |
| if(err < 0){ |
| printk("Couldn't stat \"%s\" : err = %d\n", file, -err); |
| return err; |
| } |
| |
| *modtime = buf.ust_mtime; |
| return 0; |
| } |
| |
| int os_get_exec_close(int fd, int* close_on_exec) |
| { |
| int ret; |
| |
| do { |
| ret = fcntl(fd, F_GETFD); |
| } while((ret < 0) && (errno == EINTR)) ; |
| |
| if(ret < 0) |
| return(-errno); |
| |
| *close_on_exec = (ret&FD_CLOEXEC) ? 1 : 0; |
| return(ret); |
| } |
| |
| int os_set_exec_close(int fd, int close_on_exec) |
| { |
| int flag, err; |
| |
| if(close_on_exec) flag = FD_CLOEXEC; |
| else flag = 0; |
| |
| do { |
| err = fcntl(fd, F_SETFD, flag); |
| } while((err < 0) && (errno == EINTR)) ; |
| |
| if(err < 0) |
| return(-errno); |
| return(err); |
| } |
| |
| int os_pipe(int *fds, int stream, int close_on_exec) |
| { |
| int err, type = stream ? SOCK_STREAM : SOCK_DGRAM; |
| |
| err = socketpair(AF_UNIX, type, 0, fds); |
| if(err < 0) |
| return(-errno); |
| |
| if(!close_on_exec) |
| return(0); |
| |
| err = os_set_exec_close(fds[0], 1); |
| if(err < 0) |
| goto error; |
| |
| err = os_set_exec_close(fds[1], 1); |
| if(err < 0) |
| goto error; |
| |
| return 0; |
| |
| error: |
| printk("os_pipe : Setting FD_CLOEXEC failed, err = %d\n", -err); |
| os_close_file(fds[1]); |
| os_close_file(fds[0]); |
| return(err); |
| } |
| |
| int os_set_fd_async(int fd, int owner) |
| { |
| int err; |
| |
| /* XXX This should do F_GETFL first */ |
| if(fcntl(fd, F_SETFL, O_ASYNC | O_NONBLOCK) < 0){ |
| err = -errno; |
| printk("os_set_fd_async : failed to set O_ASYNC and " |
| "O_NONBLOCK on fd # %d, errno = %d\n", fd, errno); |
| return err; |
| } |
| #ifdef notdef |
| if(fcntl(fd, F_SETFD, 1) < 0){ |
| printk("os_set_fd_async : Setting FD_CLOEXEC failed, " |
| "errno = %d\n", errno); |
| } |
| #endif |
| |
| if((fcntl(fd, F_SETSIG, SIGIO) < 0) || |
| (fcntl(fd, F_SETOWN, owner) < 0)){ |
| err = -errno; |
| printk("os_set_fd_async : Failed to fcntl F_SETOWN " |
| "(or F_SETSIG) fd %d to pid %d, errno = %d\n", fd, |
| owner, errno); |
| return err; |
| } |
| |
| return 0; |
| } |
| |
| int os_clear_fd_async(int fd) |
| { |
| int flags = fcntl(fd, F_GETFL); |
| |
| flags &= ~(O_ASYNC | O_NONBLOCK); |
| if(fcntl(fd, F_SETFL, flags) < 0) |
| return -errno; |
| return 0; |
| } |
| |
| int os_set_fd_block(int fd, int blocking) |
| { |
| int flags; |
| |
| flags = fcntl(fd, F_GETFL); |
| |
| if(blocking) flags &= ~O_NONBLOCK; |
| else flags |= O_NONBLOCK; |
| |
| if(fcntl(fd, F_SETFL, flags) < 0) |
| return -errno; |
| |
| return 0; |
| } |
| |
| int os_accept_connection(int fd) |
| { |
| int new; |
| |
| new = accept(fd, NULL, 0); |
| if(new < 0) |
| return -errno; |
| return new; |
| } |
| |
| #ifndef SHUT_RD |
| #define SHUT_RD 0 |
| #endif |
| |
| #ifndef SHUT_WR |
| #define SHUT_WR 1 |
| #endif |
| |
| #ifndef SHUT_RDWR |
| #define SHUT_RDWR 2 |
| #endif |
| |
| int os_shutdown_socket(int fd, int r, int w) |
| { |
| int what, err; |
| |
| if(r && w) what = SHUT_RDWR; |
| else if(r) what = SHUT_RD; |
| else if(w) what = SHUT_WR; |
| else { |
| printk("os_shutdown_socket : neither r or w was set\n"); |
| return -EINVAL; |
| } |
| err = shutdown(fd, what); |
| if(err < 0) |
| return -errno; |
| return 0; |
| } |
| |
| int os_rcv_fd(int fd, int *helper_pid_out) |
| { |
| int new, n; |
| char buf[CMSG_SPACE(sizeof(new))]; |
| struct msghdr msg; |
| struct cmsghdr *cmsg; |
| struct iovec iov; |
| |
| msg.msg_name = NULL; |
| msg.msg_namelen = 0; |
| iov = ((struct iovec) { .iov_base = helper_pid_out, |
| .iov_len = sizeof(*helper_pid_out) }); |
| msg.msg_iov = &iov; |
| msg.msg_iovlen = 1; |
| msg.msg_control = buf; |
| msg.msg_controllen = sizeof(buf); |
| msg.msg_flags = 0; |
| |
| n = recvmsg(fd, &msg, 0); |
| if(n < 0) |
| return -errno; |
| |
| else if(n != sizeof(iov.iov_len)) |
| *helper_pid_out = -1; |
| |
| cmsg = CMSG_FIRSTHDR(&msg); |
| if(cmsg == NULL){ |
| printk("rcv_fd didn't receive anything, error = %d\n", errno); |
| return -1; |
| } |
| if((cmsg->cmsg_level != SOL_SOCKET) || |
| (cmsg->cmsg_type != SCM_RIGHTS)){ |
| printk("rcv_fd didn't receive a descriptor\n"); |
| return -1; |
| } |
| |
| new = ((int *) CMSG_DATA(cmsg))[0]; |
| return new; |
| } |
| |
| int os_create_unix_socket(char *file, int len, int close_on_exec) |
| { |
| struct sockaddr_un addr; |
| int sock, err; |
| |
| sock = socket(PF_UNIX, SOCK_DGRAM, 0); |
| if(sock < 0) |
| return -errno; |
| |
| if(close_on_exec) { |
| err = os_set_exec_close(sock, 1); |
| if(err < 0) |
| printk("create_unix_socket : close_on_exec failed, " |
| "err = %d", -err); |
| } |
| |
| addr.sun_family = AF_UNIX; |
| |
| /* XXX Be more careful about overflow */ |
| snprintf(addr.sun_path, len, "%s", file); |
| |
| err = bind(sock, (struct sockaddr *) &addr, sizeof(addr)); |
| if(err < 0) |
| return -errno; |
| |
| return sock; |
| } |
| |
| void os_flush_stdout(void) |
| { |
| fflush(stdout); |
| } |
| |
| int os_lock_file(int fd, int excl) |
| { |
| int type = excl ? F_WRLCK : F_RDLCK; |
| struct flock lock = ((struct flock) { .l_type = type, |
| .l_whence = SEEK_SET, |
| .l_start = 0, |
| .l_len = 0 } ); |
| int err, save; |
| |
| err = fcntl(fd, F_SETLK, &lock); |
| if(!err) |
| goto out; |
| |
| save = -errno; |
| err = fcntl(fd, F_GETLK, &lock); |
| if(err){ |
| err = -errno; |
| goto out; |
| } |
| |
| printk("F_SETLK failed, file already locked by pid %d\n", lock.l_pid); |
| err = save; |
| out: |
| return err; |
| } |